YAMAMOTO Takashi wrote: > hi, > >> Daisuke Nishimura wrote: >>> Hi, Yamamoto-san. >>> >>> I'm reviewing and testing your patch now. >>> >> In building kernel infinitely(in a cgroup of >> memory.limit=64M and swap.limit=128M, with swappiness=100), >> almost all of the swap (1GB) is consumed as swap cache >> after a day or so. >> As a result, processes are occasionally OOM-killed even when >> the swap.usage of the group doesn't exceed the limit. >> >> I don't know why the swap cache uses up swap space. >> I will test whether a similar issue happens without your patch. >> Do you have any thoughts? > > my patch tends to yield more swap cache because it makes try_to_unmap > fail and shrink_page_list leaves swap cache in that case. > i'm not sure how it causes 1GB swap cache, tho. > Agree. I suspected that the cause of this problem was the behavior of shrink_page_list as you said, so I thought one of Rik's split-lru patchset: http://lkml.org/lkml/2008/3/4/492 [patch 04/20] free swap space on swap-in/activation would reduce the usage of swap cache to half of the total swap. But it didn't help, so I think there may be some other causes. Thanks, Daisuke Nishimura. _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
